Supplies an array of custom SMTP header parameters with name - value pairs (to, cc, bcc, from, subject, reply-to, etc.).
If you use the e-mail client function Reply All upon receiving the e-mail, the recipients of the new e-mail will be generated from the original SMTP header parameters, and the sender, unless the from field was defined in the message header.
Examples:
- Name: to
Value: Customers - Name: subject
Value: Order E2E Bridge - Name: reply-to
Value: info@e2e.ch